Re: [Qemu-devel] GSoC 2017 Proposal: TCG performance enhancements

[Peter Maydell]

On 7 June 2017 at 16:45, Lluís Vilanova <address@hidden> wrote:
> This speed comes at the cost of exposing TCG operations to the instrumentation
> library (i.e., the library can inject TCG code; AFAIR, calling out into a
> function in the instrumentation library is slower than PIN).

Mmm, that's awkward. I'm not sure I'd really like to allow arbitrary
user instrumentation to inject TCG code: it's exposing our rather
changeable internals to the user, and it's a more complicated
interface to understand. For user-facing API (as opposed to
instrumentation interfaces within QEMU which we use to implement
something more simplified to present to the user) I would favour
a clean and straightforward API over pure speed.

thanks
-- PMM